Overview Runtime Library
The E-TRAN Runtime Library for PSCAD contains models which accept the identical data as required in PSS/E. The library contains transformers, phase shifters, dc links, loads (constant PQ, Current or Impedance), switched shunt devices, measurement blocks etc.
The devices in this library have been tested against the loadflow results generated by PSS/E (see Theory->Matching the Loadflow). This library is required in order to run PSCAD cases which have been generated by E-TRAN, and is compatible with PSCAD V4.x.
Direct translation of Power System Data into PSCAD
Direct translation of Power System Data into PSCAD
Direct translation of Power System Data into PSCAD
Direct translation of Power System Data into PSCAD
Direct translation of Power System Data into PSCAD
Direct translation of Power System Data into PSCAD
Auto-Routing
The algorithm used to automatically generate the circuit layout in PSCAD based purely on busses and connection information (from the PSS/E.raw file) is based on Graph Theory.Add your main body content here.
The algorithm used to automatically generate the circuit layout in PSCAD based purely on busses and connection information (from the PSS/E.raw file) is based on Graph Theory.Add your main body content here.
Auto-Routing
The algorithm used to automatically generate the circuit layout in PSCAD based purely on busses and connection information (from the PSS/E.raw file) is based on Graph Theory.Add your main body content here.
The algorithm used to automatically generate the circuit layout in PSCAD based purely on busses and connection information (from the PSS/E.raw file) is based on Graph Theory.Add your main body content here.
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Example 1
The first image shows a portion of a network near a bipolar HVDC converter station The circuit is loaded in PSCAD V4 and was directly generated by E-TRAN from a PSS/E .raw input file. (Click on the image to download a higher resolution picture.)
The original circuit was more than 18,000 busses, but, for this example, E-TRAN directly translated only 1 bus away (which resulted in a 15 bus circuit) from the HVDC bus and formed a network equivalent of the remaining circuit.
The second image shows the equivalent network on a sub-page. The voltage magnitude and phase angle of the equivalent sources are automatically calculated to match the power flow of the solved loadflow. Note the multi-port equivalent is valid for steady state as well as for open/short circuit conditions.
E-TRAN converted the circuit, using only the PSS/E .raw file, directly into a PSCAD Version 4 .psc file in three phase Single Line Diagram (SLD) format.
Frequently Asked Questions
Currently, versions 23-26, 29, 30, 31, 32, 33, and 34 are supported.
E-TRAN can generate three-phase Single Line Diagram (SLD) circuit .psc or .pscx files for PSCAD V4.2, and x4.6.
Check that the .raw file being used is “solved” and has the updated loadflow solution saved in it. Also check that fundamental frequency behaviour of any models in the E-TRAN Substitution Library match that of the standard E-TRAN components (If you turn off the Substitution Library, does the solution then match?). Finally, check DC links to see if they are operating correctly. The DC link controls may have to be adjusted to work in very weak systems (If you use the “Infinite Bus” option in the DC link component, does the loadflow then match?
Detailed EMT models (such as transformers with saturation, frequency dependent transmission lines) are essential for any meaningful study (especially for over-voltage, harmonic studies?). E-TRAN supports a Substitution Library which allows a user to enter the detailed model data maintaining/managing the data in a PSCAD library and will automatically use the detailed data if it is available. The fundamental frequency impedances from the loadflow file are used to generate multi-port network equivalents, and, to determine the steady state powerflow. The powerflow is used to initialize all machines, sources, generators or any device. E-TRAN will automatically modify the initial condition information of machines found in the Substitution Library (which in turn will initialize any exciter, governor, multi-mass system), and in general can provide initial conditions for any device. This means E-TRAN can directly generate a circuit ready for EMT studies, complete with frequency dependent lines, detailed generator/exciter/governor models, detailed HVDC/SVC/FACTS devices etc. providing that the user has entered this data once in a library.
The PSCAD Master library models performs RMS or instantaneous PQ measurement (for example, the sum of VA.IA + VB.IB + VC.IC etc.), which includes the effect of all sequence components and the effect of harmonics. The E-TRAN PQ measurements devices (or voltage measurements) measure the +ve sequence, fundamental frequency quantities (used in loadflow programs), not the instantaneous or RMS quantities. This effect is particularly obvious at locations where there are significant harmonics (such as near a commutating model of a DC link). If the instantaneous quantities being measured are sinusoidal, distortion free and balanced (i.e., only +ve sequence), the results should match.
You can visit http://www.electranix.com/software or you can send e-mail to the Electranix Corporation.
You can visit http://www.PSCAD.com or you can send e-mail to the PSCAD Support team at support@PSCAD.com . PSCAD is developed and supported by the Manitoba HVDC Research Centre Inc (http://www.hvdc.ca).
The E-TRAN program is always under development. Future releases will translate transient stability data in addition to the loadflow data and will form dynamic equivalents. These will include the effects of machine inertia and controls in the network equivalents. We also plan to support additional input formats (in addition to the PSS/E .raw format). If you have any ideas or suggestions for improvements to E-TRAN, please send them to us.
